This page covers Agniveer Army Technical Electromagnetic Waves with complete concept notes, 18 graded practice MCQs, key points and exam-specific tips. Free to study.
18graded MCQs · easy to hard · full solution & trap analysis
The speed of electromagnetic waves in vacuum is approximately 3 × 10⁸ m/s. If the frequency of an electromagnetic wave is 6 × 10¹⁴ Hz, what is its wavelength?
Which of the following correctly represents the relationship between electric field (E), magnetic field (B), and velocity (c) in an electromagnetic wave?
An electromagnetic wave has a wavelength of 4 × 10⁻⁷ m in vacuum. To which region of the electromagnetic spectrum does it belong?
The frequency of an electromagnetic wave is 2 × 10¹⁵ Hz. What is the energy of a single photon of this wave? (Use h = 6.6 × 10⁻³⁴ J·s)
Which statement correctly describes a property of electromagnetic waves?
The relationship between the speed of electromagnetic waves (c), electric field (E), and magnetic field (B) in vacuum is given by:
An electromagnetic wave has a frequency of 5 × 10¹⁴ Hz. What is its wavelength in vacuum? (Use c = 3 × 10⁸ m/s)
Which of the following correctly represents the relationship between electric field (E), magnetic field (B), and the direction of propagation in an electromagnetic wave?
The energy density of an electromagnetic wave in vacuum is given by u = ε₀E². If the electric field amplitude is doubled, by what factor does the energy density increase?
An electromagnetic wave propagates in a medium with refractive index n = 1.5. If the frequency is 6 × 10¹⁴ Hz, find its wavelength in the medium. (c = 3 × 10⁸ m/s)
Which electromagnetic wave has the shortest wavelength?
The intensity of an electromagnetic wave is proportional to the square of its amplitude. If the amplitude of an EM wave is reduced to one-third of its original value, the intensity becomes:
The speed of electromagnetic waves in a vacuum is independent of which of the following?
An electromagnetic wave of wavelength 4 × 10⁻⁷ m travels through a glass slab (n = 1.6). What is the frequency of the wave in the glass? (c = 3 × 10⁸ m/s)
An electromagnetic wave travels in a medium with refractive index 1.5. If the frequency of the wave is 6 × 10¹⁴ Hz, what is the wavelength of the wave in the medium? (Take c = 3 × 10⁸ m/s)
Which of the following correctly describes the relationship between electric field E, magnetic field B, and velocity v of propagation in an electromagnetic wave in vacuum?
An electromagnetic wave has a wavelength of 500 nm in vacuum. When this wave enters a medium with refractive index 1.33, what is the frequency of the wave in the medium? (Take c = 3 × 10⁸ m/s)
The electric field amplitude of an electromagnetic wave is 120 V/m. What is the corresponding magnetic field amplitude? (Take c = 3 × 10⁸ m/s)